retain backups only for 3 days; beyond that the user is responsible for...

retain backups only for 3 days; beyond that the user is responsible for copying files off of the machine

CHANGELOG.md

@@ -4,6 +4,10 @@ CHANGELOG
 To-be-released
 --------------
 
+Breaking changes:
+
+* On-disk backups are now retained for a minimum of 3 days instead of 14. Beyond that the user is responsible for making off-site copies.
+
 Control panel:
 
 * The control panel has a new page for installing SSL certificates.

management/backup.py

@@ -16,7 +16,7 @@ from utils import exclusive_process, load_environment, shell
 
 # destroy backups when the most recent increment in the chain
 # that depends on it is this many days old.
-keep_backups_for_days = 14
+keep_backups_for_days = 3
 
 def backup_status(env):
 	# What is the current status of backups?